and Co." factory mark and "Fabrique par d'Apres les dessins De" and black facsimile signature of "Theodore R. Davis" also green printed "H & Co." and blue printed designed patented "AUGUST 10th 1880;" and a pair of "Martha Washington States" plates made by Shenango China Co. for the Washington Bicentennial in 1932, each with red printed retailers mark "Dulin & Martin Co., Washington, DC." D, of former plate: 9 in (22.9 cm); D, of latter plates: 8-3/8 in (21.3 cm) See Illustration.